thread.c: use RUBY_VM_CHECK_INTS
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46880 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread.c: use RUBY_VM_CHECK_INTS
RUBY_VM_CHECK_INTS().
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46880 b2dd03c8-39d4-4d8f-98ff-823fe69b080e